Mixer for gas burners



Oct. 23, 1923. 1,471,381

H. c. CALDWELL MIXER FOR GAS BURNERS Filed July 17. 1920 .Ettorn e bustioi't,

orifice for controlling the size'thereof.

Patented Oct. 23, 1923.

UNiT'E'D" Parents i mm c. CALDWELL, or Bonito. NEwYo nKo MIXER For; GAS soiinmis,

Application med July 17,

To all whom it may con'ce'lm."

Be it known'that I, HENRY C. CALDWELL, a citizen ofthe United States of America-,l and a resident of the citjfof Buifailo, may

of Erie, and 'State .of New York, have in- F ui'th'eiino're; in 'preser'it day burners,' it is ifmfiossib'le to supply the ropei amount of air to the hiirner to crea ljardpercorn-f iiiithoiit (iaiis rnghaok-fire into the mixentuhe 'Wheri I the gas' 'is shut ofl.

ln prdd'iling niy' inveiitidti', I have sought to provide'afiilei ice *Which shall fovercome the disadvantages above enumerated and one i'n the extreme innerend of the gas ipe or immediately in f ame bfthe g orifice. f V Fl li'tllr fntlle, the" 'shai ejhfthe"gaslorific' andtheiiiethotl"ofcohtrollingthe seasi of, is uch that the shape of the cross-seetion of thefstfeani of -gas"at the orifice' shall mmain s'ubstaiiti'ally ii'nc'hanged for different rates of floti of gas 'fromt e'oiiifihef Moiedt er'tI haref 'sought' to; provide .a mixer for gas burners, by ivhich shall he possible to V slipFlj all the 'air that 'is neqesf sary forkefiieien y I, H time one in w liichhack-fii'ing "sha'll lfifen tirely el iminated when the gas is Sllllt "bfi f The above objects and adyantages have been aecoinplished' by the device shown in i it i d in s 9 h h Figi lsho WS 1 side lex' apip of my device, partly in seetiph Qandattaohed to the end 0 1 a suitable bui-hefi means i s and same; enie 1920; Serial mi. 396,906.

Fig. -2 is a planview of the same.

Fig. 3 is an enlarged end viewbfthe regulating lvalve sh wing the gas" orifice; formed the'reiri in lts'full h an position. Fig; 4 is asi'n iilar' view, skewing the valve in a partlyhlo sed position.

Fig. 5 is a'similar'view, eliciting the Valve in a nearly closedposition.

While I have not shown and willfnot describe a burner-in conneiztioi'iwith my invention, it is obvious thatfthe mixef' is I adaptable for any suitable buriier.

In the accompanying drawiligslOi-epre sents the inixing tfi'be which" isexte'nded into the burnerfor conducting the fiiel eleinentsf thereto. I 7 i a largeair opening 111 at-eacli sidethereof.

A throttle tubl? is sli dab ly inhurited v'vith- 'in themixer tli bB lQ and rox 'ided iith suitablej handle 13 Wh'erehjr the throttle tube vice, and 2 *theg'a Eocltfofo ontrdllin' the 20 is the 'gasii'egiilat'ing it alte of "tie;

and extends pre ei 'ah'lydowij 'thron he slot is arm is provided ivi'ithi I 22 slidabkvi h nt b e g 7711: "will be sei fi b refereno to Fio'. '2 that yvhen 8 g v endhf the at'ni 22 is-at at r ii idli r i 'ithrottle tiihe 12 ther by substantially shutshutoff (as shown in full lines') thehnte f l a e il l 31 m "of the 810:6 "21 a dj hasj arew the link a as; sofiis "to substantially close the I sio t pi 'a f ihl e ig th 91 E1 1 When t e gas colck ql is opened I as shown in dottedilinesin ,Z the 61 mg end f the am] Qg igflid W thin the siep' 27 witho it' ositi'gnlo the arm 26. During this motion t e thI'OftljllbQ 12 will remain in the position shown hy'the full lines in l and 2, and it may then be opened tofsuit the conditions in the burner. \V hen the throttle tube 12 is in its fully opened posit-ion the arm 26 will occupy the position shown by the dot and dash lines in Fig. 2. This arrangement provides means for supplying the necessary quantities of air for proper combustiomand at-the same time insures against back-firing by closing the air openings .11 at the same time that the gas is shut ofi".

The gas regulating valve 20 is provided with a central member28 having an orifice 34 of substantially triangular cross-section, with its lower apex 35 at substantially the center of the central member. A rotating sleeve 29 is disposed about the central member and has its rear end turned into a groove 30 formed in the central member whereby it is prevented frominoving endwise. A handie 31 is provided for rotating the sleeve 25). A cam-shaped opening 32 is formed in the end wall of the sleeve 29 and is so formed that it will cut off the orifice 34, starting at the upper corner and continuing downwardly toward the apex .35. By reference to Figs. 3,,4: and 5 itwvill clear that in Fig. 3, the opening 34 is at its maximum, while in Fig. 4. it is partiallyshut off by the rotation of the sleeve 29. In Fig, 5 the opening is almost entirely closed. The complete closure of the opening is accomplished y a further rotation of: the sleeve 29.

While I have shown and preferably use a gas regulating valve20,, itis clear that thecock 1 may be used to regulate aswell as control the supply of gas. if desired.

From the. foregoing, it Will be obvious that, although proper quantities of air may be added to the gas to'produce proper and efiicient combustion, back-firing cannot occur because, with'the shutting ofi'of the gas at the cock 21,.theair ov enings 11 are also substantially closed. Tlih regulating valve 20 does not have to be altered except for a different sized flame or. for different gas pressures. Preferably the cook 21 is not used for regulating the flow of gas but is simply for fully shutting 01f or fully turning on thegas.

Instead of connecting the gas cock with the air-contro'llin means, clearly, I could, with the same a vantage, connect the gas regulating valve. with the air-controlling means Without materially changing the preferable construction herein shown and described. These and other modifications of the details herein shown and described may be made Without departing from the spiritof m invention or the scope of the appended c aims, and I do not, therefore, wish to be limited to'the exact embodiment herein shown and described, the form described bein merely a preferred embodiment thereof I claim "is;

Having thus described my invention what 1. A mixer for gas burners comprising means for controlling the supply of gas to the mixer, means for controlling the supply of air to the mixer, the air controlling means being operable independently of the gas controlling 1116395 When the gas means are fully or partially'open, and means connecting the gas controlling meansand the air controlling means for, reducing the air supply. when the gas supply; is rcduced, or

shut olflif theair supply has been .previs increased, thereby preventing bacle firing.

2. A mixer for gas burners comprising a mixer tube, a gas cock for controlling the supply of gas to the mixer tube, a throttle tube, carried by the mixer tube for controlling the air supply to the burner, means for operating the throttle tube independently of the gas cock when the gas cock is fully or partially open, and means connecting the gas cock and the throttle tube for reducing the size of the air, ope-nin s when the gas supply is reduced or shut o if the air supply has been previously increased, whereby back-firing is prevented.

U- mixer tube, a gascock for controlling a supply of gas to the mixer tube, a. throttle tube carried by the mixer tube for controlling the air supply to the burner, means for operating the throttle tube independently of the gas cock ,Whcnthe gas cock isffully or partially open, an oscillating arm carriedby the cock, a linkconnecting the throttle tube and the arm and formed with an arouate slot in which thearm 1s slidab1e, whereby the gas supply and the air supply may be increased independently of each other and reduced simnltaneously if the air supply has been previously increased.

l. Agas mixer comprising a gas regulating valve, having a single triangularly shaped orifice, a plate havin A opening arranged in fronto? the orifice for regulating the size of the orifice, and means for rotating the plate to control the size of the orifice.

5. A gas mixer comprising a gas regulating valve, being formed with a single triangularly shaped orifice, having one; of its apices substantially coincident with the axis of the valve, a plate having a cam-shaped opening arranged in front of the orifice for regulating the size of the orifice, and means for rotating the plate to control the size of the orifice.

6. A gas mixer comprising a gas regulating valve, having a single triangularly shaped orifice, a plate arranged in front of the orifice and so formed that when rotated it will progressively close the orifice in the valve, and means for rotating the plate.

A mixer for gas burners comprising a a cam-shaped axis of the valve, a plate arranged in front of the orifice and so formed that when rotated it will gradually reduce the orifice in the valve, and means for rotating the plate.

8. A mixer for gas burners comprising a mixer tube, a gas regulating valve for regulating the amount of gas supplied to the mixer tube, a gas cock for controlling the supply of gas to the valve, a throttle tube carried by the mixer tube for controlling the air supply to the burner, means for operating the throttle tube independently of the gas valve and the gas cook when the cock is fully or partially open, means for independently operating the gas valve, and means connecting the gas cook and throttle tube for reducing the size of the air openings when the gas supply is reduced or shut oil by the cock, if the air supply has been previously increased, whereby back-firing is 25 revented.

9. A mixer for gas burners comprising means for controlling the supply of gas to the mixer, means for regulating the gas supply, means for supplying air to the mixer, whlch are operable independently of the gas controlling means, and means connecting the gas controlling means and air controlling means for reducing the air supply when the gas supply is reduced or shut off by the controlling ineans, ii the air supply has been previously increased, thereby preventing back-firing.

10. A gas mixer comprising a gas regulating valve Which is formed with a single triangularly shaped orifice, having one of its apiccs substantially coincident with the axis of the valve, a plate arranged in front of the orifice and so formed that when rotated it will gradually reduce the orifice in the valve from the outer periphery toward the apex of the orifice which is coincident with the axis of the valve, and means for rotating the plate.

In testimony whereof I have hereunto signed my name.

HENRY C. CALDWELL. 

